Hey, you! Yeah YOU!
How come you haven't registered? Have you read about our new blue star program? We are donating $10 of each blue star subscription to the Blue Ribbon Coalition to ensure that we will have trails to recreate on for years to come.
Our blue star comes with all the benefits of a red star such as 10 second searching, blue/red star member only giveaways, access to the private blue/red star member forums, etc.

Yes, a 4.0 HO head will fit on a 258 block with some mods. Search the web as it is one of the most common swaps out there. 87-90 XJs had a 4.0 if they were a 6 cyl, non HO and used a renix fuel injection system. The YJs keep the 258 carbed motor up to 90. 91 was the first year for the 4.0 HO obd1 injected motor in a YJ and a XJ. Quick easy way to tell 258s and 4.0s apart is the fuel pump. If it has a mechanical pump, or a place to mount one it is a 258. No 258s were fuel injected from the factory and all had a mechanical pump. 4.0s were injected and have a electric pump. A quick look at the throttle body will tell a renix from a obd1 and later. Renix's have 3 mounting bolts to the manifold and obd1 and later have 4 bolts.

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